Now I open NetBeans > Open Project & add the plugin folder.
-It shows my plugin as module.
-I double click the module and it opens as its own section (see sceenshot; Module BackTracer)
-I can't run the module on it's own - it can't find certain dependencies.
-I can run the Gephi-plugin project: it starts Gephi and my plugin runs fine.

Now I add some breakpoints in the Module BackTracer, specifically in the BackTracerBuilder (on various points, methods & line breakpoints). I also defined a Class entry breakpoint.

None of those breakpoints ever hit. Why?

Btw: in NetBeans the code shows as containing a lot of errors. However, this is code 100% copied from an existing plugin with some names changed. It runs 100% functional and mvn org.gephi:gephi-maven-plugin:validate doesn't give me any errors/warning. Weird right?